Advisory agreement cost of assets maximum.

No definition available.

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

Property management fees as a percentage of gross revenue.

+ References

No definition available.

+ Details

Name:	nyrt_PropertyManagementFeesAsAPercentageOfGrossRevenue
Namespace Prefix:	nyrt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Related party transaction asset management fees earned above threshold.

+ References

No definition available.

+ Details

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Namespace Prefix:	nyrt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Related party transaction asset management fees earned above threshold advisory agreement cost of assets maximum.

+ References

No definition available.

+ Details

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Namespace Prefix:	nyrt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Related party transaction asset management fees earned by related party percentage of benchmark.

+ References

No definition available.

+ Details

Name:	nyrt_RelatedPartyTransactionAssetManagementFeesEarnedByRelatedPartyPercentageOfBenchmark
Namespace Prefix:	nyrt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Related party transaction hurdle amount.

+ References

No definition available.

+ Details

Name:	nyrt_RelatedPartyTransactionHurdleAmount
Namespace Prefix:	nyrt_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Related party transaction incentive fee excess of hurdle amount percentage.

+ References

No definition available.

+ Details

Name:	nyrt_RelatedPartyTransactionIncentiveFeeExcessOfHurdleAmountPercentage
Namespace Prefix:	nyrt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Related party transaction oversight fees earned by related party percentage of benchmark.

+ References

No definition available.

+ Details

Name:	nyrt_RelatedPartyTransactionOversightFeesEarnedByRelatedPartyPercentageOfBenchmark
Namespace Prefix:	nyrt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Related party transaction property management fees earned by related party percentage of benchmark.

+ References

No definition available.

+ Details

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Namespace Prefix:	nyrt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

This represents the company's cost incurred during an accounting period for managing the money in a fund, which will be billed back to the client and is a component of noninterest expenses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.14)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

+ Details

Name:	us-gaap_NoninterestExpenseInvestmentAdvisoryFees
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Receivables to be collected from (obligations owed to) related parties, net as of the balance sheet date where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k)(1))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

+ Details

Name:	us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Details

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- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=nyrt_AdvisorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=nyrt_AdvisoryAndConsultingFeeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=nyrt_ServiceProviderAndAffiliatesMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=nyrt_WinthropAdvisorAndItsAffiliatesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=nyrt_AssetManagementFeesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DeferredRevenueArrangementTypeAxis=nyrt_AverageInvestedAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DeferredRevenueArrangementTypeAxis=nyrt_GrossRevenueMultiTenantPropertiesMember
Namespace Prefix:
Data Type:	na
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- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
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Related Party Transactions and Arrangements - Additional Information (Detail) - Liquidation Value [Member] - USD ($)			1 Months Ended	3 Months Ended
	Feb. 28, 2017	Jan. 03, 2017	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Mar. 07, 2017	Mar. 01, 2017
Related Party Transaction [Line Items]
Cost reimbursed as compensation				$ 167,000
Advisor [Member]
Related Party Transaction [Line Items]
Asset management fees as a percentage of benchmark							0.50%
Cost of assets maximum							$ 3,000,000,000
Advisor [Member] \| Advisory and Consulting Fee [Member]
Related Party Transaction [Line Items]
Fees paid to related parties	$ 500,000	$ 500,000
Service Provider and Affiliates [Member]
Related Party Transaction [Line Items]
Asset management fees as a percentage of benchmark								0.325%
Cost of assets maximum								$ 3,000,000,000
Asset management fees earned above								0.25%
Incentive fee, percentage of excess of hurdle amount			10.00%
Hurdle amount (in dollars per share)			$ 11.00
Property management fees as a percentage of gross revenue			1.75%
Winthrop Advisor and its Affiliates [Member]
Related Party Transaction [Line Items]
Fees paid to related parties				1,064,000	$ 1,713,000
Asset management fees and compensation reimbursements payable				9,000		$ 46,000
Winthrop Advisor and its Affiliates [Member] \| Asset Management Fees [Member]
Related Party Transaction [Line Items]
Fees paid to related parties				863,000	$ 1,667,000
Asset management fees and compensation reimbursements payable				$ 2,400,000
Average Invested Assets [Member] \| Advisor [Member]
Related Party Transaction [Line Items]
Cost of assets maximum							$ 3,000,000,000
Asset management fees earned above							0.40%
Gross Revenue, Multi-tenant Properties [Member] \| Advisor [Member]
Related Party Transaction [Line Items]
Property management fees as a percentage of benchmark							4.00%
Gross Revenue, Multi-tenant Properties [Member] \| Advisor [Member] \| Maximum [Member]
Related Party Transaction [Line Items]
Oversight fees as a percentage of benchmark							1.00%